20783396 has 6 divisors (see below), whose sum is σ = 36370950. Its totient is φ = 10391696.

The previous prime is 20783393. The next prime is 20783407. The reversal of 20783396 is 69338702.

It can be written as a sum of positive squares in only one way, i.e., 10797796 + 9985600 = 3286^2 + 3160^2 .

It is not an unprimeable number, because it can be changed into a prime (20783393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2597921 + ... + 2597928.

It is an arithmetic number, because the mean of its divisors is an integer number (6061825).

Almost surely, 2^20783396 is an apocalyptic number.

It is an amenable number.

20783396 is a deficient number, since it is larger than the sum of its proper divisors (15587554).

20783396 is a wasteful number, since it uses less digits than its factorization.

20783396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195853 (or 5195851 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20783396 is about 4558.8810030533. The cubic root of 20783396 is about 274.9405755897.

The spelling of 20783396 in words is "twenty million, seven hundred eighty-three thousand, three hundred ninety-six".